It popped up a few times, in crosswords that were quite close together - that's probably why it's stuck in my mind. As a police station, the spelling can be - tana, tanna(h), thana(h) and thanna(h).
You're welcome Malone. You usually put me on the right track. Can anyone guide me as to where to start in the grid with the answer to 1d? I am getting stressed!